file position on tape

["Douglas Olson" <dlolson@lbl.gov>]

Hi Henrik (et al),

Dave Z. and I spoke with John Riordan (and Ed and Razvan) yesterday
about getting information of where files are on tape.
The thing that looks like it should be easy to do is to
get the list, for a class of service (COS), of 
filenames, tape number, and position (order) of file on tape.
I was thinking that you could use this along with the
list of files that go into the GC index to include the
information about tape number and order on tape.
Then it would be possible (conceptually) to include this
tape information in the policy decisions about what
order to retrieve files.
Dave will be back at LBL on Thursday and can talk to you
about it, and probably show you an example of a file that
has the tape information.  If you recall, he got information
like that about the files we used at the end of MDC1.
Why don't you think about that and consider whether it
is possible to use it in MDC2.

Thanks,
Doug

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